The Helmet Diamond Glass 5D is a tempered glass screen protector specifically designed to shield your Oppo A40 from scratches, impacts, and general mechanical damage. Its 5D construction ensures full surface coverage, extending across the curved edges of the Oppo A40 screen to provide a more comprehensive layer of defense than standard flat protectors. Featuring a discreet black border, this glass maintains the original brightness of your display and preserves touch sensitivity, so you can interact with your device naturally. It is a practical choice for anyone looking to keep their Oppo A40 screen pristine without compromising the visual clarity or the tactile experience of the phone.